what size tube for rear radiator

[twoslo4five0]

So I have a surplus amount of aluminized tube sitting here. Thin wall and I think like 1 or 1.25 inch diamater. Im thinking about using it for my rear radiator and of corse have rubber on the engine/radiator ends. Ive been trying to think in my mind why small diamater tube like this wont work and I cant come up with one, except mabye cavitation but I dont think it flows that fast correct?

If anyone is wondering what this tube came from,this was orginally a large dog pen

 

[Deuling]

This buggy is all 1.75 DOM .12 wall. And the coolant runs through the upper "frame rails" back to the rad. It works. And thats a LONG ways.

 

[twoslo4five0]

so that 1.5 id correct? Thats still larger than mine, I see people running that size frequently. I just dont see if a convenionce thing or there is a reason.

 

[Deuling]

Whats the id of the water pump and waterneck?

Only issue with smaller would be pushing less fluid. I know he has a 1.5" .120 wall slug in that system somewere and it works fine. That would come out to 1.25ish id.

 

[twoslo4five0]

im not real sure. I was going to buy a ALUM radiator but now im thinking I may use this 6.2 rad sitting here.

 

[twoslo4five0]

Went out to the shop and did some measuring.

My tube is 1.25 od with a 1.20 ID, like I said thin.
Termostat housing is 1.34 (or some where close)
water pump is 1.40

So all fairly close.

 

[Deuling]

Thats sooo close... If you got it, run it. You willl know if it needs to be changed.

Plus all that aluminum tube will disperse heat really well too

 

[miniwally]

I have 1.5" .120 wall tubing for my water pipes. Several thousand race miles says it's fine.

 

[kennyw]

.120 wall tubing for my water pipes

Sounds like it is a little on the heavy side...